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Method for removing sulfate radical from lead sulfate alkaline electrolyte

A technology of sulfate radical and lead sulfate, which is applied in the electrolysis process, electrolysis components, lead-acid batteries, etc., can solve the problems of ineffective regeneration of sodium hydroxide NaOH, increase in environmental protection treatment costs, etc., so as to achieve less environmental pollution and reduce production costs. , Comprehensive utilization of good effect

Active Publication Date: 2015-04-22
六盘水中联工贸实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology can reduce sulfate ion SO 4 2- harm, but to produce sodium sulfate Na 2 SO 4 solution and calcium carbonate CaCO 3 slag, resulting in an increase in environmental protection treatment costs, and the effect of converting and regenerating sodium hydroxide NaOH is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] With barium hydroxide Ba(OH) 2 Treatment of alkaline electric lead waste liquid, according to Ba(OH) 2 / SO 4 2- =1~1.1, Ba(OH) 2 Between 80 and 90 0 C is dissolved or directly added to the waste liquid of electric lead, at 80-90 0 C was reacted for 3 hours, filtered to obtain BaSO 4 White precipitate, NaOH was determined to increase from 174.4g / l to 229.7g / l, and then the treated electric lead waste liquid was treated with lead sulfate PbSO 4 Slag leaching, the lead leaching rate is 87.9% (calculated based on the Pb content in the leaching slag).

[0026] Present embodiment also can use barium oxide BaO, and barium oxide BaO is dissolved in water and becomes barium hydroxide Ba(OH) 2 .

Embodiment 2

[0028] With the electric lead waste liquid of embodiment 1 press Ba(OH) 2 / SO 4 2- =0.8 at 85 0 Add Ba(OH) under C condition 2 , reacted for 3 hours, filtered to get BaSO 4 White precipitate, measured NaOH increased from 197g / l to 233g / l, then lead sulfate PbSO 4 Slag leaching, the lead leaching rate is 81.2% (calculated based on the Pb content in the leaching slag).

Embodiment 3

[0030] With the electric lead waste liquid of embodiment 1 press Ba(OH) 2 / SO 4 2- =1 at 90 0 Add Ba(OH) at C 2 , reacted for 3 hours, filtered to get BaSO 4 White precipitate, NaOH increased from 219.3g / l to 249.2g / l, use this NaOH solution to leach lead sulfate PbSO 4 The leaching rate of slag and lead is 85.92% (calculated by slag).

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Abstract

The invention discloses a method for removing sulfate radical from lead sulfate alkaline electrolyte. The method comprises the following steps: removing sulfate radical SO4<2-> from alkaline waste electrolyte with barium hydroxide Ba(OH)2 or barium oxide BaO, and thus sodium hydroxide NaOH is regenerated, and barium sulfate BaSO4 is also obtained and lead in lead waste electrolyte is not lost in a barium sulfate BaSO4 sediment; adding barium hydroxide Ba(OH)2 or barium oxide BaO according to the amount of Ba(OH)2 / SO4<2-> being 1 to 1.1 or Ba(OH)2 / Pb being 0.5 to 1, wherein the operation temperature is 80-900 DEG C and the time is 3-4 hours; heating the generated white sediment with clear water to 40-600 DEG C according to the liquid-to-solid ratio being 2-5, washing for 2-3 times, drying the obtained white solid, so as to form amorphous barium sulfate BaSO4, returning the lead waste electrolyte from which SO4<2-> is removed and extracting lead sulfate PbSO4. The sulfate radical SO4<2-> is removed from the alkaline lead waste electrolyte with barium hydroxide Ba(OH)2 or barium oxide BaO; meanwhile, NaOH is regenerated, and thus the high-quality barium sulfate BaSO4 product is obtained.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a method for removing sulfate radicals from lead sulfate alkaline electrolyte. Background technique [0002] Lead Sulfate PbSO 4 The slag is leached with sodium hydroxide NaOH to obtain sodium plumbate Na 2 PbO 2 and sodium sulfate Na 2 SO 4 , Sodium hydroxide NaOH is regenerated after the electrolysis of metallic lead, but a considerable part of the sodium ion Na + Na 2 SO 4 The form is occupied and cannot be converted to sodium hydroxide NaOH. During electrolyte circulation, sodium sulfate Na 2 SO 4 Continuous enrichment, on the one hand, lead sulfate PbSO 4 The leaching rate decreases, and on the other hand, a large amount of sodium sulfate Na 2 SO 4 Crystallization, blocking the pipeline, so that the production can not be carried out smoothly. In order to make the sulfate ion SO 4 2- Open circuit, part of the electrolytic waste liquid was used to open the circuit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B15/08H01M10/12H01M10/08
CPCY02E60/10Y02P70/50
Inventor 李世平钟波张彬
Owner 六盘水中联工贸实业有限公司
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